在java中使用dom4j解析xml
阿新 • • 發佈:2018-02-24
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創建xml文檔並輸出到文件
import java.io.File; import java.io.FileOutputStream; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; public class Demo { public static void main(String[] args) throws Exception { Document doc = DocumentHelper.createDocument(); //增加根節點 Element books = doc.addElement("books"); //增加子元素 Element book1 = books.addElement("book"); Element title1 = book1.addElement("title"); Element author1 = book1.addElement("author"); Element book2 = books.addElement("book"); Element title2 = book2.addElement("title"); Element author2 = book2.addElement("author"); //為子節點添加屬性 book1.addAttribute("id", "001"); //為元素添加內容 title1.setText("Harry Potter"); author1.setText("J K. Rowling"); book2.addAttribute("id", "002"); title2.setText("Learning XML"); author2.setText("Erik T. Ray"); //實例化輸出格式對象 OutputFormat format = OutputFormat.createPrettyPrint(); //設置輸出編碼 format.setEncoding("UTF-8"); //創建需要寫入的File對象 File file = new File("D:" + File.separator + "books.xml"); //生成XMLWriter對象,構造函數中的參數為需要輸出的文件流和格式 XMLWriter writer = new XMLWriter(new FileOutputStream(file), format); //開始寫入,write方法中包含上面創建的Document對象 writer.write(doc); } }
運行後會在D盤下生成一個books.xml
使用Iterator叠代器的方式來解析xml
xml文檔如下:
<?xml version="1.0" encoding="UTF-8"?> <books> <book id="001"> <title>Harry Potter</title> <author>J K. Rowling</author> </book> <book id="002"> <title>Learning XML</title> <author>Erik T. Ray</author> </book> </books>
import java.io.File; import java.util.Iterator; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class Demo { public static voidmain(String[] args) throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read(new File("books.xml")); Element root = document.getRootElement(); Iterator it = root.elementIterator(); while (it.hasNext()) { Element element = (Element) it.next(); //未知屬性名稱情況下 /*Iterator attrIt = element.attributeIterator(); while (attrIt.hasNext()) { Attribute a = (Attribute) attrIt.next(); System.out.println(a.getValue()); }*/ //已知屬性名稱情況下 System.out.println("id: " + element.attributeValue("id")); //未知元素名情況下 /*Iterator eleIt = element.elementIterator(); while (eleIt.hasNext()) { Element e = (Element) eleIt.next(); System.out.println(e.getName() + ": " + e.getText()); } System.out.println();*/ //已知元素名情況下 System.out.println("title: " + element.elementText("title")); System.out.println("author: " + element.elementText("author")); System.out.println(); } } }
運行結果:
用List列表的方式來解析xml
import java.io.File; import java.util.List; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class Demo { public static void main(String[] args) throws Exception { SAXReader reader = new SAXReader(); File file = new File("books.xml"); Document document = reader.read(file); Element root = document.getRootElement(); List<Element> childElements = root.elements(); for (Element child : childElements) { //未知屬性名情況下 /*List<Attribute> attributeList = child.attributes(); for (Attribute attr : attributeList) { System.out.println(attr.getName() + ": " + attr.getValue()); }*/ //已知屬性名情況下 System.out.println("id: " + child.attributeValue("id")); //未知子元素名情況下 /*List<Element> elementList = child.elements(); for (Element ele : elementList) { System.out.println(ele.getName() + ": " + ele.getText()); } System.out.println();*/ //已知子元素名的情況下 System.out.println("title" + child.elementText("title")); System.out.println("author" + child.elementText("author")); //這行是為了格式化美觀而存在 System.out.println(); } } }
在java中使用dom4j解析xml